thomas chen wrote:
ohci can handle two urb_submit by DELAYing one for the next frame?
No, it handles them by _queueing_ the second one so that it'll start after the first one finishes. In the case of OHCI, the typical case is that the hardware automatically advances that queue ... no software attention is needed until later, unless there's some kind of fault seen with the first URB. (And NAK isn't a fault.)
i guess the question is that can two packets be sent in the same frame?
URB != packet. At USB 1.1 speeds, multiple packets per frame will be typical. - Dave
if not.. then the driver is responsible for delaying one??? i guess that is the problem... the driver i have does not seem to do that properly and slave starts sending nack after that... thanks
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